BIOS1001 Study Guide - Quiz Guide: Ionic Bonding, Ionic Compound, Metallic Bonding
Document Summary
Positive ions (cations) form by metals losing valence electrons (oxidation). Negative ions (anions) form by non-metals gaining electrons (reduction). The number of electrons lost or gained is determined by electron configuration: Criss-cross method: determine the charges of the ions, write the charge as a subscript to the other ion. Ionic bonding involves the transfer of electrons from the outer energy level of one atom to the outer energy level of another. An ionic bond is the electrostatic attraction between oppositely charged ions. They are formed: between a metal and a non-metal, by elements with an electronegativity difference of 1. 8 units or greater. Ionic compounds usually have a lattice structure of alternating positively and negatively charged ions with the ions held in fixed positions. Volatility (the tendency of a substance to vaporise): volatility is very low due to the strong electrostatic forces of attraction. Solubility: dissolve in polar solvents, do not dissolve in non-polar solvents.
